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Thanks to [this answer](https://collab.codidact.org/posts/288973/288978#answer-288978) and [related comments](https://collab.codidact.org/comments/thread/7925#comment-20708) I was able to install bundle without sudo privileges.

The problems were:
- On Debian 11 WSL: I installed bundler with `sudo apt install bundler` before to install Ruby with rvm. Then, it install a ruby version in `/var/lib`. It seems that this path, set up by apt, was taken as default bundler path even if I installed after a new ruby version with rvm without sudo...

- On Debian 12 on VBox: I should not do `sudo apt install rbenv` because it creates also a ruby installation directory in `/var/lib`...

So, the "good" workflow (for me) with rvm was (tested on Debian 11 WSL and Debian 12 on VBox):
```
curl -sSL https://rvm.io/mpapis.asc | gpg --import -
curl -sSL https://rvm.io/pkuczynski.asc | gpg --import -
curl -sSL https://get.rvm.io | bash -s stable
```

<details>
<summary>
Outputs of the last command (for "zetyty" user):
</summary>

```
~$ curl -sSL https://get.rvm.io | bash -s stable
Downloading https://github.com/rvm/rvm/archive/1.29.12.tar.gz
Downloading https://github.com/rvm/rvm/releases/download/1.29.12/1.29.12.tar.gz.asc
gpg: Signature made Fri 15 Jan 2021 07:46:22 PM CET
gpg:                using RSA key 7D2BAF1CF37B13E2069D6956105BD0E739499BDB
gpg: Good signature from "Piotr Kuczynski <[email protected]>" [unknown]
gpg: WARNING: This key is not certified with a trusted signature!
gpg:          There is no indication that the signature belongs to the owner.
Primary key fingerprint: 7D2B AF1C F37B 13E2 069D  6956 105B D0E7 3949 9BDB
GPG verified '/home/zetyty/.rvm/archives/rvm-1.29.12.tgz'
Installing RVM to /home/zetyty/.rvm/
    Adding rvm PATH line to /home/zetyty/.profile /home/zetyty/.mkshrc /home/zetyty/.bashrc /home/zetyty/.zshrc.
    Adding rvm loading line to /home/zetyty/.profile /home/zetyty/.bash_profile /home/zetyty/.zlogin.
Installation of RVM in /home/zetyty/.rvm/ is almost complete:

  * To start using RVM you need to run `source /home/zetyty/.rvm/scripts/rvm`
    in all your open shell windows, in rare cases you need to reopen all shell windows.
Thanks for installing RVM 🙏
Please consider donating to our open collective to help us maintain RVM.

👉  Donate: https://opencollective.com/rvm/donate
```
</details>

As mention in the rvm install output above, I have to run `source /home/zetyty/.rvm/scripts/rvm` in order to be able to use rvm command.

And finely the ruby install:
```
rvm install 3.1.2
```

After this, the `bundle install` of QPixel works without sudo!